Across
1
Basic unit of life
3
Particle of light
4
Icy body with a tail near the sun
6
Group of similar cells
8
Unit of electric potential
9
Infectious microscopic agent
10
Substance with pH below 7
Down
2
Form of thermal energy
3
Positive particle in nucleus
4
Solid with repeating atomic pattern
5
Path of a planet around the sun
7
Push or pull on an object